Sargent 8251-ET Storeroom Dead...
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$1,848.69
$1,402.11
Sargent Sargent 8200 Series - (8251) Storeroom Deadbolt Function Escutcheon Trim, Heavy Duty Single Cylinder with Deadbolt Mortise Lock, Grade 1 SGT-8251-ET

Sargent 8251-ET Storeroom Deadbolt Function Mortise Lock with Escutcheon Trim - Grade 1 Heavy Duty Single Cylinder

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Model: 8251 LE1A 26D
From the 8200 Series Collection
$1,848.69
$1,402.11
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In Stock (leaves warehouse same day if ordered before 3pm ET)

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Sargent 8251-ET Grade 1 Storeroom Deadbolt Mortise Lock with Escutcheon Trim - Heavy Duty Single Cylinder

Industry Benchmark Heavy-Duty Mortise Lock with Maximum Security Performance

The Sargent 8200 Series mortise lock represents the industry benchmark for commercial mortise locks, delivering maximum security, performance, and durability with high-quality components. This Grade 1 storeroom deadbolt function lock features heavy-duty construction with a 2 3/4" backset, 1 3/4" door thickness compatibility, and 3/4" latchbolt throw. The multi-functional lock body design offers exceptional versatility with field-reversible handing and integrates with all SARGENT key systems including Degree, Signature, KESO, and XC.

Professional Features & Benefits

  • Precise Door Specifications: Standard 2 3/4" backset depth with 1 3/4" door thickness and 3/4" latchbolt throw for reliable operation and proper door preparation.
  • Exceptional Durability Rating: UL Cycle Above and Beyond test completed at 16 million cycles (Verification ID: V584148) for unmatched reliability in high-traffic commercial applications.
  • Grade 1 Security Performance: ANSI/BHMA A156.13 Series 1000 Operational Grade 1 certification with curved lip strike and heavy-duty construction for maximum security resistance.
  • Heavy-Duty Construction: Patented design and construction with high-quality components provide exceptional durability for commercial applications.
  • Universal Key System Integration: Compatible with all SARGENT key systems (Degree, Signature, KESO, and XC) with 6 pin or 7 pin cylinder options for flexible access control.
  • Field-Reversible Design: Handing can be changed on-site without additional parts, reducing inventory requirements and installation complexity.
  • Comprehensive Fire Rating: UL 10C positive pressure and UL-cUL Fire-Rated up to 3 hours with NFPA 80 compliance for critical fire safety applications.
  • Manufacturer Warranty: 10-year limited warranty with 2-year coverage on electrical components for long-term confidence and protection.

Technical Specifications

  • Refer to manufacturer documentation for complete technical specifications.

Installation & Operation

  1. Review manufacturer specifications and verify door preparation requirements including 1 3/4" door thickness, 2 3/4" backset, and proper mortise pocket dimensions.
  2. Use manufacturer-provided templates to mark mounting hole locations accurately on door and frame surfaces for precise mortise lock installation.
  3. Prepare door and frame by cutting mortise pocket and drilling required holes for lock body, cylinder, and strike plate per manufacturer specifications.
  4. Install lock body into mortise pocket and secure cylinder and escutcheon trim components to door per manufacturer torque specifications.
  5. Adjust latchbolt and deadbolt operation for proper alignment, smooth operation, and secure latching with 3/4" throw engagement.
  6. Test lock operation with keys and verify proper function of storeroom deadbolt mechanism. Make final adjustments as needed and refer to manufacturer documentation for complete installation details.

Professional Applications

  • Commercial Office Buildings
  • Educational Facilities
  • Healthcare Institutions
  • Retail Establishments
  • Industrial and Warehouse Facilities
  • Multi-Tenant Residential Properties
  • Government and Municipal Buildings

Why Choose Sargent Quality?

Sargent 8200 Series mortise locks deliver professional-grade reliability with patented design and construction rated for 16 million cycles in independent UL testing. The 10-year limited warranty with 2-year electrical component coverage provides exceptional long-term protection. Engineered for demanding commercial applications where maximum security, durability, and dependable performance are essential for protecting people and property.

Product Specs

Series:
8200 Series
Grade:
Grade 1
Keyed Function:
Single Cylinder
Product Group:
Mechanical Locks
Product Subgroup:
Bored Locksets
Subcategory:
Bored Locksets
Keyed:
Yes
Commercial/Residential:
Commercial
Lock Type:
Mortise
Lock Function:
Storeroom Deadbolt
Product Type:
Mortise Locks
Duty Level:
Heavy Duty
Handle Type:
Lever
Product Attribute:
Mortise Locks
Electronic:
No
Product Function:
Storeroom
Product Category:
Mechanical Locks
Collection:
8200 Series
Department:
Door Hardware

Sargent 8251 LE1A 26D – Frequently Asked Questions

1) What does the Sargent 8251 storeroom deadbolt function actually do at the door?
The 8251 is a storeroom function mortise lock with a deadbolt. The outside lever stays locked at all times and is retracted by key only; the inside lever always retracts the latchbolt for free egress. The deadbolt is thrown by key from the outside. It is a single cylinder lock, so there is no key operation on the inside. Use it on stockrooms, mechanical rooms, IT closets, and any opening that must stay secure but never lock someone in.
2) Do I have to specify handing when I order the Sargent 8251?
Handing on the 8251 lock body is field reversible, so it can be changed on site without extra parts. That is why a property manager or locksmith can stock one lock and cover left and right hand openings across a building. Note that the escutcheon trim and lever are symmetrical in use, but the lock body is what carries the reversing feature.
3) Can the Sargent 8251 go on a fire rated door?
Yes. The 8200 Series mortise lock is UL 10C positive pressure tested and UL-cUL fire rated up to 3 hours, with NFPA 80 compliance. The storeroom function also suits fire door use because the inside lever always allows egress without a key.
4) What cylinder do I need to order with the Sargent 8251, and can I use my existing interchangeable core?
Four cylinder choices are ordered with the lock: a standard cylinder, less cylinder, 70 for small format interchangeable core prep less core, or 60 for large format interchangeable core prep less core. If your facility already keys on SFIC or LFIC cores, pick the matching prep and drop your own core in. Keying is ordered separately as keyed different, keyed alike, or to a specific key code; choose the None keying option when you order less cylinder.
5) Will the Sargent 8251 work on our existing Sargent master key system?
It integrates with all SARGENT key systems, including Degree, Signature, KESO, and XC, in 6 pin or 7 pin cylinders. If your campus is already mastered on a Sargent system, this lock can be keyed into it rather than run as a standalone. Specify keyed alike or supply the key code at order time to bring it onto an existing set.
6) Will the Sargent 8251 latch into the strike already in my frame?
The lock ships with a curved lip strike and throws a 3/4 inch latchbolt at a 2-3/4 inch backset. If your existing frame is prepped to the standard ANSI strike cutout used by commercial mortise locks, the supplied strike drops in. Where you are replacing a non-Sargent mortise lock, check the deadbolt pocket in the frame as well, since this function throws a separate deadbolt above the latch and the frame has to accept both.
7) My door is prepped for a 2-1/2 inch backset mortise lock. Will the Sargent 8251 drop in?
No. The 8251 is a 2-3/4 inch backset lock and the mortise pocket has to match. Baldwin mortise bodies such as the 6310 entry/storeroom are 2-1/2 inch backset, so those two preps are not interchangeable. Either re-prep the door to 2-3/4 inches or order a lock built for the backset already in the leaf.
8) What is the closest Grade 1 storeroom mortise lock equivalent to the Sargent 8251-ET from another manufacturer?
The Accentra 8805FL is the nearest straight equivalent - it is a Grade 1 storeroom function mortise lock from the 8800 Series, matching the 8251-ET on both grade and storeroom function. The Cal-Royal NM8080 is another Grade 1 storeroom mortise lockset, listed for 1-3/4 inch doors, which is the door thickness the Sargent 8251-ET is built for. The distinguishing detail on the Sargent is that the 8251 is a storeroom deadbolt function - it carries a deadbolt in addition to the latch - while the Accentra 8805FL and Cal-Royal NM8080 are listed as storeroom function without a deadbolt called out.
9) Is there an electronic or keypad alternative if I do not want to issue keys for a storeroom door?
The Sargent 8251-ET is a mechanical, non-electronic lock keyed with a single cylinder. If you would rather manage credentials than cut keys, the Command Access ML190 Series is a heavy-duty storeroom function motorized mortise lock with field selectable EL/EU operation on 24VDC, which is the closest function-for-function electronic counterpart. For standalone keypad entry without wiring, the BEST 45HZ EZ Series is an electronic keypad mortise lock with key override. The Accentra NTM623-NR nexTouch Generation 3 uses a capacitive touchscreen keypad with cylinder override and no deadbolt, so it will not replace the deadbolt the 8251 carries.
10) What should I use on doors that are not 1-3/4 inch thick?
The Sargent 8251-ET is specified for 1-3/4 inch door thickness. For thicker doors, the Hager 3800 Series covers 1-3/4 to 2-1/2 inches in the 3810E passage with escutcheon and the 3850E office lever with escutcheon. For thinner doors, the Alarm Lock DL2700CR and DL3500CR electronic mortise locks list 1-5/8 to 1-7/8 inches, and the Baldwin 6310 entry/storeroom mortise body lists 1-3/8 inch and over on a 2-1/2 inch backset rather than the 2-3/4 inch backset the Sargent uses. Note these differ from the 8251 in function, so confirm the function before substituting.
11) Which mortise lock should I use if the door needs to be electrically locked or unlocked from an access control panel?
The Sargent 8251-ET is a mechanical lock with no electrical option. For electrified mortise, the Schlage L9092EU with 03A trim is a heavy duty corridor function mortise lock, keyed outside, with request to exit and 12/24VDC operation for 1-3/4 inch doors. The BEST 45HW Series is a heavy duty wired electromechanical mortise lock running 12V or 24V. The Command Access ML190 is a heavy-duty storeroom function motorized mortise lock at 24VDC with field selectable fail safe or fail secure, which keeps the storeroom function the 8251 provides.
12) For a classroom intruder or lockdown application, what replaces the Sargent 8251-ET?
The 8251-ET is storeroom deadbolt function, keyed from the outside only, which does not let a teacher secure the room from inside. For lockdown, the BEST 45HCA Series is a heavy duty mortise lockbody in intruder function, and the TownSteel FME-4000 Series is a Grade 1 heavy duty electronic intruder classroom mortise lockset with RFID for 1-3/4 inch doors. The TownSteel FME-2000 Series is a Grade 1 heavy duty classroom mortise lockset with RFID on the same 1-3/4 inch door thickness if you want credential-based classroom control without the intruder feature.
13) Is the Sargent 8200 mortise lock rated for high traffic like a school corridor or hospital?
It carries ANSI/BHMA A156.13 Series 1000 Operational Grade 1 certification and completed UL Cycle Above and Beyond testing at 16 million cycles (Verification ID V584148). Grade 1 is the top commercial tier, and that cycle count is well past normal Grade 1 minimums, which is why the 8200 shows up in schools, hospitals, and government buildings.
14) What is the difference between the ET escutcheon trim and rose trim on the Sargent 8200?
The ET designation means this one ships with escutcheon trim, a full plate covering the lock area, rather than a small sectional rose. Four escutcheon styles are offered: LE1, LS, LW1, and WT. Escutcheon trim covers more of the door face, which is useful when you are replacing older hardware and need to hide previous prep marks. The Sargent installation template covers both sectional rose and escutcheon trims for the 7800 and 8200 series.
15) Which lever and finish combinations does the Sargent 8251 come in for matching the rest of a building?
Eight lever designs are offered: A, B, E, F, J, L, P, and W. Finishes run sixteen deep, from 03 bright brass and 04 satin brass through 10B dark oxidized satin bronze oil rubbed, 26D satin chrome, 32D satin stainless, and the BSP black and WSP white suede powder coats. If you are standardizing a portfolio, pick the lever and finish first and carry it across every 8200 function you order so the openings match.
16) I need a storeroom mortise lock but not the deadbolt. What else is there?
If the deadbolt is not wanted, the Accentra 8805FL is a Grade 1 storeroom mortise lock from the 8800 Series with an Arcadia lever, and the Cal-Royal NM8080 is a Grade 1 storeroom mortise lockset for 1-3/4 inch doors with an interchangeable core option. Both cover the same storeroom behavior. Stay with the Sargent 8251 when the opening needs a key-thrown deadbolt on top of the locked outside lever.
17) Can I use the Sargent 8251 on a classroom door instead of a classroom function lock?
Not really. Storeroom function keeps the outside lever locked permanently, so a teacher cannot unlock the corridor side to leave it open between periods. For that behavior go to a classroom function mortise lock such as the Corbin Russwin ML2003, a Grade 1 mortise classroom lockset for 1-3/4 inch doors, or the Cal-Royal NM8070 Grade 1 classroom mortise lockset. The Sargent 8251 is the right pick when the door should never be left unlocked.
18) Does the Sargent 8251 support card readers or keypads, or is it mechanical only?
Mechanical only. The 8251 is a keyed mechanical mortise lock with no electronics. If you need credential or code access on the same style of mortise prep, look at electronic mortise locks such as the TownSteel FME-2000 Series Grade 1 RFID mortise lockset for 1-3/4 inch doors, the Schlage CO-100 standalone electronic mortise lock with keypad reader, or the Dormakaba E-Plex 2066 pushbutton keyless mortise lock.
19) What preparation does the door need before the Sargent 8251 goes in?
A 1-3/4 inch leaf with a mortise pocket cut for the lock body at a 2-3/4 inch backset, plus drilled holes for the cylinder, the lever spindles, and the escutcheon fasteners, and a frame prepped for the curved lip strike. Sargent publishes an installation template covering the 7800 and 8200 series with sectional rose and escutcheon trims, and the 7800/8200 Mortise Lock Catalog carries the full dimensional data. Mark from the template rather than from the old hardware.
20) Can I use a BEST 45H mortise lock body in place of the Sargent 8251?
They are not interchangeable as ordered. The BEST 45H Series is a heavy duty mortise lock body in public entrance function, and the 45HCA Series is a heavy duty lockbody in intruder function - both are lock bodies rather than a complete keyed set. The Sargent 8251-ET ships as a keyed single cylinder storeroom deadbolt lock with escutcheon trim, so it includes the lever and escutcheon selection. Both the BEST 45H and the Sargent 8200 body are field reversible for handing. If you only need to replace a failed body inside an existing BEST prep, the 45H body is the right class of part; if you are outfitting a bare door, the 8251-ET is the complete assembly.
21) What is the difference between the Sargent 8251-ET and a non-keyed mortise lock like the Schlage PM010 or Falcon MA101?
The Sargent 8251-ET is keyed with a single cylinder and provides storeroom deadbolt function, meaning the outside lever stays locked and is released by key. The Schlage PM010 is a Grade 1 passage latch mortise lock, non-keyed, for 1-3/4 inch doors, and the Falcon MA101 is a Grade 1 heavy duty mortise passage lock with field reversible operation and a fire rating. Passage locks latch the door but never lock it, so they are used on corridor and closet openings that need no security. If the opening requires controlled access, the passage locks are not a substitute for the 8251.
22) I need privacy function for a restroom instead of storeroom - what mortise lock covers that?
The Sargent 8251-ET is a keyed storeroom deadbolt lock and is not a privacy lock. For privacy, the Hager 3840S is a Grade 1 privacy mortise lock with a 2-3/4 inch backset for 1-3/4 to 2 inch doors, matching the 2-3/4 inch backset the Sargent uses, and the Cal-Royal NM8440 is a Grade 1 privacy mortise lockset with deadbolt for 1-3/4 inch doors. If the privacy door also needs electronic control, the Schlage CO-100-MS-40-KP is a Grade 1 heavy duty standalone electronic mortise lock in privacy function with a keypad reader for 1-3/4 inch doors.
23) For a behavioral health or ligature-resistant opening, is the Sargent 8251-ET the right choice?
The 8251-ET uses a standard lever with escutcheon trim in A, B, E, F, J, L, P and W lever styles, which is not a ligature-resistant profile. For those openings, TownSteel offers the MRX-A-01 with satin stainless ligature resistant arch trim and the MRX-L-01 with an anti-ligature lever, both Grade 1 heavy duty mortise locksets for 1-3/4 inch doors in passage function. Marks USA also lists the 5PDN, a Grade 1 hospital passage mortise push/pull paddleset that is ligature resistant and ADA compliant in satin stainless steel. All three are passage function, so they secure nothing - pair them with the appropriate secured opening plan.
24) Is a Baldwin 6310 mortise lock a drop-in replacement for the Sargent 8251-ET?
No. The Baldwin 6310 entry/storeroom mortise lock body uses a 2-1/2 inch backset, while the Sargent 8251-ET is built on a 2-3/4 inch backset, so the door prep and cylinder location will not line up. The Baldwin 6310 is listed for 1-3/8 inch and over doors and comes in knob by knob or, as the 6310190RRLS, right hand reverse lever by lever. The Sargent is field reversible for handing without additional parts, whereas the Baldwin lever version is ordered to a specific hand.
25) What looks like a mortise lock substitute for the 8251-ET but will not actually lock the door?
Several mortise-labeled products are trim or dummy assemblies with no locking mechanism. The Schlage L0170 is a Grade 1 half dummy trim lever for 1-3/4 inch doors, the Falcon MESC600DT is a dummy escutcheon lever trim for M9900 Series exit devices, and the Emtek 3019 Brisbane, 3102 Memphis, 3104 Hamilton and 3106 Manhattan are all mortise entrance locksets in dummy function. None of these accept a key or throw a bolt. The Sargent 8251-ET is a keyed single cylinder storeroom deadbolt lock, so if the opening needs to secure, none of the dummy trims apply - order them only for the inactive leaf of a pair.
26) I need office or entrance function rather than storeroom - what mortise lockset should I look at?
Storeroom function on the Sargent 8251-ET keeps the outside lever locked at all times with key access only, which is wrong for an office door that staff need to leave unlocked during the day. The Cal-Royal NM8050 is a heavy duty Grade 1 office/entrance mortise lockset with auxiliary deadlatch for 1-3/4 inch doors. The Hager 3850E is a Grade 1 office mortise lock with lever and escutcheon on a 2-3/4 inch backset for 1-3/4 to 2-1/2 inch doors, non-keyed. The Baldwin 6301 entry/apartment mortise body is available knob by knob or as the 6301LS lever by lever on a 2-1/2 inch backset for 1-3/4 inch and over doors.
27) If I want keyless pushbutton entry on a storeroom door, what are the mortise options versus the Sargent 8251?
The Sargent 8251-ET is keyed and non-electronic. For pushbutton keyless mortise, the Dormakaba E-Plex 2066 Series is an electronic pushbutton keyless mortise lock for wide stile doors, and the E-Plex E5086 is a Grade 1 back to back pushbutton and card entry/egress mortise lock. The Dormakaba PowerPlex P2066 Series is another mortise option in that family. For credential-based access with a reader, the Dormakaba LX-I-M002 Saffire is an electronic RFID mortise lockset with BLE mobile access at BHMA Grade 2, which is a different grade than the Grade 1 the Sargent carries.
28) Can a Kaba Ilco 185 Series mortise deadbolt take the place of the Sargent 8251-ET?
Only in part. The Kaba Ilco 185 Series is a mortise deadbolt with no handing, so it throws a bolt but provides no latch or lever operation. The Sargent 8251-ET combines a storeroom latch with a deadbolt and includes lever and escutcheon trim in LE1, LS, LW1 and WT escutcheon styles. If the door already has a latching device and you only need to add a deadbolt, the 185 Series fits; if the door needs both latching and deadbolting from one lock, the 8251-ET does both.
29) Will a cylindrical lock work instead of the Sargent 8251-ET mortise lock?
Not without changing the door prep. The Sargent 8251-ET is a mortise lock requiring a mortise pocket cut into the door edge. A cylindrical lock such as the Schlage PC10, a Grade 1 passage cylindrical lock with rose for 1-3/4 inch doors, installs through a bored hole instead. Both are Grade 1 for 1-3/4 inch doors, but the preps are not interchangeable and the PC10 is non-keyed passage function rather than the keyed storeroom deadbolt function of the 8251.
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Does the Sargent 8251 LE1A 26D come with a warranty?
Absolutely. The Sargent 8251 LE1A 26D is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
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